00275nam a2200109Ia 4500082002200000100002500022245006800047260002300115300001700138500000500155700000500160  a658.9349bW266.OR  aWardle, P. A. d ed.  aOperational research and the managerial economics of forestryb  aLondonbHMSOc1971  axxiii, 140p.  a  a